David Studer vas escriure el dia dl, 04 jun 2012: > Hi everybody! > > I have a sample with n=2.000. This sample contains rare events (10, 20, 30 > individuals with a specific illness). > Now I'd like to do a logistic regression in order to identify risk factors. > I have several independent variables on an interval > scale. > > Does anyone know whether the number of these rare events is sufficient in > order to calculate a multivariate > logistic regression? Or are there any alternative models I should use? > (which are available in R)
Gary King has a couple of papers on rare events analysis in logistic regression: http://gking.harvard.edu/category/research-interests/methods/rare-events In stata the 'relogit' command applies King's advice, and I don't know of any R package doing it, sorry. Best, -- - Xavier - ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
